Actually when I saw the floating boxes thanks to @Albert! [MOD] Floating Boxes (from Water Additions Desktop Tuesday) I thought of this biome and icebergs so I believe this is very doable. The problem as it sits for me is to wait for this to be a real thing in SH or add the code to biome mod or require this one to allow for the ice chunks. The junky way to do this would be to simply create an entity that sort of floats off the ground but then you would have to account for how deep the water was. This isn’t too hard but I sort of stopped to ponder. And so that is sort of where it sits. As @Relyss stated concerning the floating boxes:
It would also be really cool to have the water simply freeze over.